<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="保存并发布"/>
    </el-steps>
    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
    <!-- 章节 -->
    <ul class="chanpterList">
      <li v-for="chapter in chapterVideoList" :key="chapter.id">
        <p> {{ chapter.title }}
          <span class="acts">
            <el-button style="" type="text" @click="openVideo(chapter.id,chapter.children.length)">添加小节</el-button>
            <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
           </span>
        </p>
        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p> {{ video.title }}
              <span class="acts">
                <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>

    <el-form label-width="40%">
      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" :disabled="saveChapterBtnDisabled" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 添加和修改小节表单 -->
    <el-dialog :before-close="handleClose" :visible.sync="dialogVideoFormVisible" title="课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.isFree">
            <el-radio :label="true" :value="1">免费</el-radio>
            <el-radio :label="false" :value="0">收费</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="上传视频">
          <el-upload
            :before-upload="beforeAvatarUpload"
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/uploadVideoAly'"
            :limit="1"
            class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
              <i class="el-icon-question"/>
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="cancelBack">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
  import chapter from '@/api/edu/chapter'
  import video from '@/api/edu/video'
  export default {
    data() {
      return {
        saveBtnDisabled : false,
        chapterVideoList:[],
        courseId:"", //课程id
        chapter:{ //封装章节数据
          title: '',
          sort: 0
        },
        video: {
          title: '',
          sort: 0,
          isFree: 0,
          videoSourceId: ''
        },
        dialogChapterFormVisible:false,//章节弹框
        dialogVideoFormVisible:false, //小节弹框
        saveChapterBtnDisabled:false,//章节弹框保存按钮
        saveVideoBtnDisabled:false,//小节弹框保存按钮
        fileList: [],//上传文件列表
        BASE_API: process.env.BASE_API // 接口API地址
      }
    },

    created() {
      //获取路由中的id值
      if(this.$route.params && this.$route.params.id){
        this.courseId = this.$route.params.id
      }
      this.getChapterVideo();
    },

    methods: {
      handleClose(done){
        this.fileList = []
        done();
      },
      //点击确定调用的方法
      handleVodRemove() {
        //调用接口的删除视频的方法
        video.deleteAliyunvod(this.video.videoSourceId)
          .then(response => {
            //提示信息
            this.$message({
              type: 'success',
              message: '删除视频成功!'
            });
            //把文件列表清空
            this.fileList = []
            //把video视频id和视频名称值清空
            //上传视频id赋值
            this.video.videoSourceId = ''
            //上传视频名称赋值
            this.video.videoOriginalName = ''
          })
      },
      //点击×调用这个方法
      beforeVodRemove(file,fileList) {
        return this.$confirm(`确定移除 ${ file.name }？`);
      },
      cancelBack(){
        this.dialogVideoFormVisible = false //小节弹框
        this.fileList = []
      },
      beforeAvatarUpload(file) {
        const isVideo  = file.type === 'video/mp4'
          || file.type === 'video/webm'
          || file.type === 'video/3gp'
          || file.type === 'video/asf'
          || file.type === 'video/avi'
          || file.type === 'video/dat'
          || file.type === 'video/dv'
          || file.type === 'video/flv'
          || file.type === 'video/f4v'
          || file.type === 'video/gif'
          || file.type === 'video/m2t'
          || file.type === 'video/m4v'
          || file.type === 'video/mj2'
          || file.type === 'video/mjpeg'
          || file.type === 'video/mkv'
          || file.type === 'video/mov'
          || file.type === 'video/mpe'
          || file.type === 'video/mpg'
          || file.type === 'video/mpeg'
          || file.type === 'video/mts'
          || file.type === 'video/ogg'
          || file.type === 'video/qt'
          || file.type === 'video/rm'
          || file.type === 'video/rmvb'
          || file.type === 'video/swf'
          || file.type === 'video/ts'
          || file.type === 'video/vob'
          || file.type === 'video/wmv'
        const isLt2M = file.size / 1024 / 1024 <= 1024
        if (!isVideo) {
          this.$message.error('上传视频格式有误!')
          this.fileList = []
        }
        if (!isLt2M) {
          this.$message.error('上传视频大小不能超过 1024MB!')
          this.fileList = []
        }
        if (isVideo && isLt2M) {
          this.saveVideoBtnDisabled = true
        }
        return isVideo && isLt2M
      },
      //上传视频成功调用的方法
      handleVodUploadSuccess(response, file, fileList) {
        this.saveVideoBtnDisabled = false
        //上传视频id赋值
        this.video.videoSourceId = response.data
        //上传视频名称赋值
        this.video.videoOriginalName = file.name
      },
      handleUploadExceed() {
        this.$message.warning('想要重新上传，请先删除已上传的视频')
      },
      //==============================小节操作====================================
      //删除小节
      removeVideo(id) {
        this.$confirm('此操作将删除小节, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {  //点击确定，执行then方法
          //调用删除的方法
          video.deleteVideo(id)
            .then(response =>{//删除成功
              //提示信息
              this.$message({
                type: 'success',
                message: '删除小节成功!'
              });
              //刷新页面
              this.getChapterVideo()
            })
        }) //点击取消，执行catch方法
      },
      //修改章节弹框数据回显
      openEditVideo(videoId) {
        this.saveVideoBtnDisabled = false //保存按钮
        this.dialogVideoFormVisible = true //弹框
        //调用接口
        video.getVideoInfo(videoId)
          .then(response => {
            this.video = response.data
            if (this.video.videoOriginalName) {
              this.fileList.push({name:this.video.videoOriginalName})
            }
          })
      },
      //添加小节弹框的方法
      openVideo(chapterId,childrenLength) {
        this.saveVideoBtnDisabled = false
        this.dialogVideoFormVisible = true//弹框
        //设置章节id
        this.video.chapterId = chapterId
        this.video.sort = childrenLength

        //表单数据清空
        this.video.title = ''
        this.video.isFree = 0
        this.video.videoSourceId = ''
      },
      //添加小节
      addVideo() {
        this.saveVideoBtnDisabled = true
        //设置课程id
        this.video.courseId = this.courseId
        video.addVideo(this.video)
          .then(response => {
            //关闭弹框
            this.dialogVideoFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '添加小节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },
      //修改小节的方法
      updateVideo() {
        this.saveVideoBtnDisabled = true
        video.updateVideo(this.video)
          .then(response =>  {
            //关闭弹框
            this.dialogVideoFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '修改小节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },
      saveOrUpdateVideo() {
        if(this.video.id) {
          this.updateVideo()
        } else {
          this.addVideo()
        }
        this.fileList = []
      },

//==============================章节操作====================================
      //删除章节
      removeChapter(chapterId) {
        this.$confirm('此操作将删除章节, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {  //点击确定，执行then方法
          //调用删除的方法
          chapter.deleteChapter(chapterId)
            .then(response =>{//删除成功
              //提示信息
              this.$message({
                type: 'success',
                message: '删除成功!'
              });
              //刷新页面
              this.getChapterVideo()
            })
        }) //点击取消，执行catch方法
      },
      //修改章节弹框数据回显
      openEditChatper(chapterId) {
        this.saveChapterBtnDisabled = false //保存按钮
        this.dialogChapterFormVisible = true //弹框
        //调用接口
        chapter.getChapter(chapterId)
          .then(response => {
            this.chapter = response.data
          })
      },
      //弹出添加章节页面
      openChapterDialog() {
        this.saveChapterBtnDisabled = false //保存按钮
        //弹框
        this.dialogChapterFormVisible = true
        //表单数据清空
        this.chapter.title = ''
        //this.chapter.sort = 0
      },
      //添加章节
      addChapter() {
        //设置课程id到chapter对象里面
        this.saveChapterBtnDisabled = true
        this.chapter.courseId = this.courseId //设置课程id
        chapter.addChapter(this.chapter)
          .then(response => {
            //关闭弹框
            this.dialogChapterFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '添加章节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },
      //修改章节的方法
      updateChapter() {
        this.saveChapterBtnDisabled = true
        chapter.updateChapter(this.chapter)
          .then(response =>  {
            //关闭弹框
            this.dialogChapterFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '修改章节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },
      saveOrUpdate() {
        if(!this.chapter.id) {
          this.addChapter()
        } else {
          this.updateChapter()
        }
      },
      getChapterVideo(){
        chapter.getChapterVideo(this.courseId)
          .then(response=>{
            this.chapterVideoList = response.data
          });
      },
      previous() {
        //跳转到上一步页面
        this.$router.push({ path: '/course/info/'+this.courseId})
      },
      next() {
        //跳转到下一步页面
        this.$router.push({ path: '/course/publish/'+this.courseId})
      }
    },
    watch:{
      chapterVideoList:function() {
        this.$nextTick(function() {
          this.chapter.sort = this.chapterVideoList.length
        });
      }
    }
  }
</script>

<style scoped>
  .chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
    /*float: left;*/
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chanpterList .acts {
     float: right;
     font-size: 15px;
   }

  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    /*float: left;*/
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }
</style>

